Attachment-plug for electric lighting.



No. 837,182. PATENTED NOV. 27, 1906.

I D. 'B. BOWN.

ATTACHMENT PLUG FOR ELECTRIC LIGHTING.

APPLICATION FILED AUG.14, 1905.

wrrnesszs" INVENTOR UNITED STATES PATENT UFFTQE.

DAVID E. BOWN, OF PITTSBURG, PENNSYLVANIA. ATTACHMENT-PLUG Foe ELECTRICLlGHTlNG.

Specification of Letters Patent.

Patented Nov. 2'7, 1906.

Application filed August 14, 1905. Serial No. 274.019.

To all whom it may concern:

Be it known that I, DAVID E. BOWN, a resident of Pittsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new andusefullmprovement in Attachment- Plugs for Electric Lighting; and I dohereby declare the following to be a full, clear, and exact descriptionthereof. V g

My invention relates to attachment-plugs, and has special reference tosuch plugs as are used in electric lighting. I

The object of m invention is torovide an attachment-plug or the sockets0' incandescent lamps in electric lighting which will be cheap ansimplein its construction, will contain few parts, and will be capableof being manufactured easily and assembled conveniently and rapidly.

To these ends my invention consists, generally stated, in the novelarrangement, construction, and combination of arts, as hereinafter morespecifically set fort and described, and particularly pointed out in theclaims.

To enable others skilled in the art to which my invention appertains toconstruct and use my improved attachment-plug, 1 will describe the samemore fully, referring to the accompanying drawings, in which Figure 1 isa longitudinal central section of m improved attachment-plug. Fig. 2 isa side view of the same and showing a portion thereof in section. Fig. 3is a cross-section on the line 3 3, Fig. 2. Fig. 4 isa cross-section onthe line 4 4, Fig. 3. Figs. 5 and 6 are views showing another form of myimproved ll ike symbols of reference herein indicate like parts" in eachof the figures of the draw- 111 s.

As illustrated in the drawings, 1 represents my improvedattachment-plug, which is provided with the body portion 2, referablyformed of porcelain, and such b0 portion has the head 3 and shank 4formed t ereon.

The head 3 is formed integral and solid with the shank 4 and isprovided'with the curved outer face 5 and serrated ed e 6 on said face,while leading through sai head into the shank 4 of the body portion 2arethe openings or passage-ways 7 7 for the passing of the wires 8 8through the same, which are connected at their ends within said shank tothe terminals 9 9, respectively, therein.

Fitting around the shank 4 of the body portion 2 is the screw-cap 10,which is usuallyformed of brass or copper and engages with thescrew-threads i', formed on the outer face of said shank by its threadedbody 10. This screw-cap 10 carries the cap-plate 11, which is preferablyformed of porcelain and has an opening 1 1 formed through the same,through which a contact-pin 12 is adapted to pass and be screwed intothe terminal 9, while the head 12 of said in fits within a countersunkhole 13, formed in a contact-plate 13, which is held against .saidcap-plate by said pin and is adapted to engage with the contactpoint ofthe incandescent-lamp socket. (Not shown.) The inner end of the threadedbody 10 on the screw-cap 10 when in place engages witha spring-plate 14,connected to the ter minal 9, and such threaded body is adapted to engae and form contact with the usual threade lamp-socket when in dplace inthe lamps. If desired, the threade cap 10 can be permanently secured tothe body portion 2 by making indentations in the threaded body 10 ofsaid cap and also by soldering the terminal 9 to said body 10, as shownat 14 in Fig. 6, thereby doing away with the springplate 14, and in thiscase the ca -plate 11 is removably held in place in the 0d the screw orcontact-pin 12. It wil thus be seen that my improved attachment-plug isof such a construction that it will do away with a number of partsusually employed 1n this class of plugs, thereby reatly cheapening thecost of manufacture of the same and saving time in the assemblingthereof. The use of the integral or solid head enables quicker andfirmer connections to be made by oing into the bottom of the plug, andthis wi l prevent any wire from coming in contact with another, as withconnections or terminals at the top there vwas always great liabilit ofthe wires becoming loose, which woul form a short circuit, and therebycause a fire. It will also be seen that in the use of ca s for thepassing of the wires they were iable to pull ofi the plug and hang down,which is ereby avoided, and in this device there is no liability of anyof the parts becoming loose or dropping off the plug.

Various modifications and changes in the design and construction of myimproved attachmentplug'may be resorted to without departing from t espirit of the invention or sacrificing any of its advantages.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. An attachment-plug comprising a body portion having a shank, ascrew-cap-connected to said shank, and a cap-plate on said cap andremovably connected to said shank.

2. An attachment-plug comprising a body portion having a shank, ascrew-cap connected to said shank, a cap-plate on said cap and meansengaging with said shank for remov ably holding said cap in place.

3. An attachment-plug comprising a body portion having a shank, a capconnected to said shank, a'cap-plate on said cap and having an openingtherein, and a contact-pin passing through said opening and engagingwith said shank,

4. An attachment-plug for lamp-sockets

